Quote:
Originally Posted by Ether
If the rollers are not free to spin, then the wheel is no longer operating as a mecanum wheel.
... and if a swerve steering motor burns out or jams, the wheel is no longer swerving and the affected wheel will scrub.
BTW, don't use mecanum on dusty dirt, you are asking for trouble. The roller "bearings" will get contaminated and it won't operate properly any more.
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The wheel can still function as a mecanum but at a reduced performance - only some of the rollers are sticky or stuck. With our Breakaway bot it still ran fairly well even though some of the roller shafts were bent.